#!/usr/bin/env node
const http = require('http'),
      log = console.log,
      qs = require('querystring'),
      fs = require('fs');
let items =['eat','sleeping'];
let result = {
      state:200,
      reason:'ok',
      data:[],
      count:0
    };
http.createServer((req,res)=>{
  
  logRequest(req);
  if(req.url.slice(0,5) !== '/todo') {
    let html = fs.readFileSync('./12-todo.html').toString('utf8')
    if(req.url === '/'){ 
      res.end(html);
    }else if(req.url == '/12.js'){
      fs.createReadStream('./12.js').pipe(res)
    }else{
      res.end('not api');
    }
    
    return;
  }
  switch(req.method){
    case 'GET':
      select(req,res);
      break;
    case 'POST':
      insert(req,res);
      break;
    case 'PUT':
      update(req,res);
      break;
    case 'DELETE':
      remove(req,res);
      break;
    default:
      res.end(`${req.method} method not support`);
      break;
  }
  
  
}).listen(8080);

function select(req,res){
  result.data = items;
  res.end(JSON.stringify(result));
}

function insert(req,res){
  let data = '';
  req.on('data',chunk => data += chunk);
  req.on('end',()=>{
    let item = qs.parse(data).item;

    if(item !== ''&& typeof item !== undefined){
      items.push(item);
      res.end(JSON.stringify(result));
    }
    else{
      result.status = 401;
      result.reason = 'item is empty';
      res.end(JSON.stringify(result));
    }
  });
  
}

function update(req,res){
  let id = req.url.split(':')[1];
  let data = '';
  req.on('data',chunk=> data += chunk);
  req.on('end',()=>{
    let item = qs.parse(data).item;
    if(item !== '' && typeof item !== undefined){
      items[id] = item;
      res.end(JSON.stringify(result));
    }else{
      result.status = 402;
      result.reason = 'item is empty'
      res.end(JSON.stringify(result));
    }

  })
  let item = items[id];
  res.end(req.method);  
}

function remove(req,res){
  let id = req.url.split(':')[1];
  if(typeof id === 'undefined'){
    items = [];
    result.status = 200;
    result.reason = 'delete all sucess';
    res.end(JSON.stringify(result));
    return;
  }
  items = items.splice(id,1);
  result.status = 200;;
  result.reason = 'del sucess';
  res.end(JSON.stringify(result));
}


function logRequest(req){
  log(`${req.method}`);
  log(req.url);

}
